Purchase a replacement Unifying receiver for the K400 keyboard
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Your K400 keyboard is a Unifying device that can be used with any Unifying receiver. If you've lost or damaged the receiver, you can purchase a replacement from the Wireless Touch Keyboard K400 Parts Store.
The keyboard won't work with a non-Unifying receiver. To be sure you have the right receiver, look for this Unifying logo:
Important Notice: Logitech Presentation devices are now supported by Logi Options+ for a better experience. We highly recommend using Logi Options+ with your presentation remotes. We are here to assist you during this transition.
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